The engine assumes there is a single accessibility root node with ID 0. In a multi-window world, there may be multiple root nodes each with their own unique ID.

• Windows: [Windows] Remove accessibility root assumptions engine#39441
• macOS: [macOS] Remove a single accessibility root assumption engine#40316
• Linux
• Web: [Web] Remove accessibility root ID assumptions #122850
• Android: [Android] Remove accessibility root ID assumptions #122847
• iOS: [iOS] Remove accessibility root ID assumptions #122848
• Fuchsia: [Fuchsia] Remove accessibility root ID assumptions #122849
• Common: https://github.com/flutter/engine/blob/6a846703002d0b86dc54da56b39ddf7a22b271f5/shell/platform/common/accessibility_bridge.h#L51-L56

See: https://github.com/search?q=repo%3Aflutter/engine%20kRootNodeId&type=code